Condenser air-pump.



R. DQATOMLINSGN.

GONDENSBR AIR PUMP.

APPLICATION FILED JULY11,1910.

(2l/ 6MM 'unimib-STATES PATENT 'Osannal n'oYAL D. ToMLmson, orMILWAUKEE, WISCONSIN', AssIeNon 'ro ALLIs-cHALMnns coMPAnY, orMILWAUKEE, WISCONSIN, A CORPORATION or WISCONSIN.

counnusnn AIRPUMP..

l 'Specification of Letters Patent. Original application nl ed January12, 1907 SerialNo. 351,973. Divided and this applicationled July 11,

Patented .apn-8,1913.

' 1910. Serial No. 571,265.

To all lwhom t may concern.'

Be itknown that I, ROYAL D. ToMLINsoN, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented a certain new and useful Improvement in'Condenser Air-Pumps, of which the following is a specification.

This/invention relates to improvements in the construction of` steamcondensing apparatus and particularly to improvements in theconstructionof air pumps used in' connection with condensers.

An object -of the invention is to provide a condenser air pump,A whichis simple in its construction and etlicient inoperation.

Another 'object is to provideV a valveless pump. in which thedestructive eiect'of knocking due tothe' return of the'dischargingwater-into 'the -va'cumil spaces' ofthe pumpas these successivelydischarge their contents, is avoided.

Thisapplication is a. division of an 'application for patent' for. steamcondensing" apparatus, -Serial No. 351,973, filed January 12,1907,-

A clear conception ofv one embodiment of the invention can be obtainedbyreferring tothe accompanying'dawingl. The figure shows a-centralvertical section through a'condenseifhead and' condenser air pump andthe connections; communicating j between the two.;l

piston type and'postively displaces the duid.

The condensing head 1' is provided with a steam inlet 2 at its'top and awater discharge 'outlet at its lower'` end. A water inl let pipe 4 which'spreads out within the condensing chamber in the form of an umbrella orair' tra 6, enters the'condensing head 1 intermediate the inlet andoutlet thereto. A deiectorris xed to the water inlet .pipe 4V at'the endthereof which discharges into the condenser -head 1. The pump 8 has its'inlet 81 connected to the water outlet pipe 3 of-.the head l. Thedischarge outlet 82of the' pump 8 is connected through the pipe 83 tpany convenient discharge well, not shown. The pipe 83 is conneet-ed tothe atmosphere by a port 831 which is located preferably near thedischarge outlet 82. The pump 8j is of the rotary. geared pumped when1n. operation. Theimpellers l85 are geared together by gears 86, ofwhich gears the pitch lines alone are shown. The driving of the impellershafts of the pump 8 is accomplished by means of apulley or oth ersimilar means fixed to an -overhanging end of one of the impellershafts.

Air chambers 882 are placed in communication with the interior of thecasing of the pump 8 at points slightly in advance o`f the tangent pointon the impeller 85 at Vthe time the following impeller lobe is workinginto coaction with the casing. This is to insure that the impeller lobesshall isolate a working space before opening up communication betweenthe chamber 882 and the space above the inlet 81.

y Equalizing or discharge pipes 9 lead from underneath the air trap 6within the con- `denser head 1, through the head, and to the pumpsuction, discharging into the pump at inlets 91. These pipes' 9 have noport-ion .thereof dipping below and subsequently rising to a horizontalplane, or in other Words, their structure is such as to avoid theformation of liquid traps, thus insuring that these pipesform aconstantly open means for conducting gas from the condenser head 1. .Butone of t ese'pipes 9 is shown in the figure, butin practice it is usualto apply two of Athem leading same to each side of the pump 8 and alsofrom opposite points underneath the gas or air trap 6. W'ater' conductorpipes so I 92 lead into the equalizing Pipes 9 from any convenientsource, as shown, for instance, from the condensing'water inlet plpe 4..The conductor pipes 92 are controlled by valves '93, and terminate innozzles orV spray ends 94 withinthe pipes 9. The spray ends 94 aredirected toward the pump 8.

-The operation of the device is as follows.:

-Steam is condensed in the condensing chamber 5 of the condenser head 1as.it enters the .chamber at the steam inlet 2, by the inrushoecondensing. water through the pipe 4 atits discharge end just abovethe umbrella or gas trap 6. This water in rushing ott from the umbrella,is thrown against theinnerjvalls of the condenser head 1,thus forming aseal which prevents the air from returning to the spaceabove theumbrella. The condensed steam mingles'with the condensing water and themixture is discharged through the water outlet pipe 3 to the pump inlet8l. As' theimpellers 85 of the pump 8 rotate, they carry this mixture ofconlos densing water and condensed. steam Aup` wardly past the innersemicylindrical sui'- faces of the pump 8 and-discharge same -throughthe outlet .82'. The Water-is then have come into the condenser eitherwith the steam or the condensing water, will gather underneath theumbrella orgas trap 19 6 and will from there be conducted through in itspassage by the spray of water intro.

duced into .the pipe 9 from the condensing water inlet pipe 4 by meansof the conductor pipe 92. It will be noted that the gases en- 'teringthe pump 8 throughthe inlet 9 are admitted at the highest point possible.a ove The inlet 9lnis located at the point at which vthe highest vacuumis maintained in any port-ionof the apparatus. The air or gas introducedatthis point will be carried along by the impellers 85 together with anywater" entering'through' the inlet 81, and will be urged through thepump 8 with the waterpassing therethrough. lVhen 'the imp ellcr lobepasses the inlet tofthe air chamber 882, the water previously forcedinto the air chamber'882 will gradually pass out and break the vacuuminthe pump' space. As the impeller 85 proceedsand when the lobe leaves.the inner semicylindrical surface of the 'pumpcasing and moves.opposite the pump discharge 82, communication is established between theair chamber 882 and the pump discharge 82. Ihe atmospheric pressureestablished in the discharge 82 will 40 then cause waterl to rush backinto the air chamber 882 until the next succeeding lobe 1 of theimpeller 85 passes the pipe connection between the air chamber andtheinterior of the pump.

It is obvious that the chambers 882 need notbe closed at their tops asshown. "It is also obvious that instead of having an' air chambercommunicating with the pump,

` merely a communicationthrough the pump casing to thei atmosphere wouldbe sulicient. In the latter 'case the air would simply rush into thepump space to relieve the vacuum. Theremight be a slight discharge ofwater after the relieving of the vacuum, but this would not be much andcould be easily drained away.

While the invention has been described as .applied to a steam condensersystem, Ait is obvious that it might. be applied to any ap-. paratusin-"whicha gas or vapor 'is condensed to 'a liquid and also where duringsuchcondensation a high vacuum is to be maintained in the condensingchamber. Such conditions prevail in evaporators.`

It should -be understood that it is not deconducted through pipe 83 tothe discharge well. Meanwhile, any air or gas vwhich may' .gas'pas's'ageconnecti said liquid space of the pump 'above the nor- 90 Itis claimedand desired to secure by Let ters Patent,- .1. The combination cfachamber, a gas t-rap in the chamber, a pump 4having a space therein forliquid, means for conductingliquid from the ,chamber to said liquidspace of .the pump, a separate 4constantlyopen ,.f"

means connecting the gas trap to said liquid space ofthe pump at a pointintermediate' the inlet andthe discharge of the pump for conducting gasto the pump to commingle with the liquid in said liqu'id space, such gasconducting means Abeing so located and ex# tended that liquid thereinwill gravitate to.-

ward said liquid space of the pump. l Y 2Q the normal water line in thepump inlet 81.

2. The combination of a chamber, a pump having aspace therein forliquid,-a liquid 'passage between the chamberand said lid-- uidspace'ofthe pun'ifand a constantly open im 'iig the, chamber;v with malwater' level therein, said 'gas passage being'so directed and extendedas to gravitate liquid-therein toward sai ,liquid `sp ace of 3. Thecombination of a chamber, apuinp having a space therein for liquid,.means for conducting liquid fromthechainber to said liquid space' ofthe pump, and separatecon# stantly open meansof communication be tweenthe-chamber and said liquid space' of' the,pump, said-ineans connectingwith said liquid space of the pump from a levlhigher than that of theconnection lof the'means.

with said liquid space of the pump.

.4. The combination o f v-a chamber, a mechanically operated pump, aconstantly open means of communication for liquid between .the l,chamberand the pump, `and a vmeans off'communication constantly open forthefree and unobstructed passage of gas between' thechamber and the pumpseparate 'from the first mentioned means of communication and connectingto said pump at a higher level than the point of connection to said pumpof the "first .mentioned means of 11'5 communication. l

5. The combination of a chamber, a pump, means for conducting li uidfrom thc ,chamber to the pump, an separate means of communicationconstantlyopenlgo for the free and unobstructed passage of gas leadingfrom the chamber to the pump but both means connecting to the commonpump chamber, said separate means being so located andl extended thatvany liquidthat mightfind its way therein wlll by gravity be carriedinto the pump and said separate means connecting to said pump at ahigher level than the pointotconnection to said pump of the said liquidconducting means. 13o

Losses@ Water pv ssag'e leading from said chamber' ieto Said casing etthe suction side thereof,

' sind en air pessage leading,f from said chamacting rotary loliedtherein having Water passage leading sint within tlie portion of seicasing ed by the impeller lobes, said passage se located and extended asto gravi- Wate 'therein into said pump d mineller type, of an air inletpas le; ing into the pump chamber at a 'o om 'iunicate with thedisplacement ,spaces alter they are cut 0E from the suction side of thepump and before lthey are delivered to ti e discharge side oi the pump.V

8. llie combination, in a vacuum pump having v pair or ooacting rotarylobed iin- A Tellers and its discharge outiet uppermost, an air inletpassage leading into each side opi' the impeller chamber in position tocomniunieate with the displacement spaces after they ere separated fromthe suction side of the pump .andbefore they are delivered to thedischarge side tire' pump.

l. el Vacuum pump herring pair of coimpellers inte die suction side ofsaid pum easing A coo'nation, in a vacuum pump of mountedfle into thebottom of the impeller chamber and an air passage leading into thesuction side of the impeller chamber at a point above the lowermostposition of the impeller' lobes.

4vl0. The combination of a chamber, a pump having a pair of coactingrotary lobed impellers, means for conducting a liquid from the chamberto thev pump, and separate means for conducting gas from said 'chamberto said pump at a point Within the travel or" the impeller lobes.

il. The combination ot a chamber, a pump having a space therein forliquid, a liquid passage between the chamber and said liquid space ofthe pump, and a constantly open gas passage connecting the chamber withsaid liquid space of the pump.

l2. ln combination, a chamber, means for conducting liquid from saidchamber, a constantly open means for conducting gas from said chambersaid conducting means havin structural features by means of which liquidtraps are avoided, 4and a single pump for urging liquid and gasrespectively through their said conducting means.

' in testimony whereof, I affix my signature in the presence of twoWitnesses.

' RGYAL D. TOMLINSON.

Witnesses:

Gr. l?. DE WEIN, W. H. LIEBER.

